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package cgeo.geocaching.geopoint;
import cgeo.geocaching.ICoordinates;
import cgeo.geocaching.R;
import cgeo.geocaching.geopoint.GeopointFormatter.Format;
import cgeo.geocaching.geopoint.direction.DDD;
import cgeo.geocaching.geopoint.direction.DMM;
import cgeo.geocaching.geopoint.direction.DMS;
import cgeo.geocaching.geopoint.direction.Direction;
import cgeo.geocaching.network.Network;
import cgeo.geocaching.network.Parameters;
import cgeo.geocaching.utils.Log;
import org.apache.commons.lang3.StringUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import android.location.Location;
import android.os.Parcel;
import android.os.Parcelable;
/**
* Abstraction of geographic point.
*/
public final class Geopoint implements ICoordinates, Parcelable {
public static final double deg2rad = Math.PI / 180;
public static final double rad2deg = 180 / Math.PI;
public static final float erad = 6371.0f;
private final double latitude;
private final double longitude;
private Direction direction;
private DDD ddd;
private DMM dmm;
private DMS dms;
/**
* Creates new Geopoint with given latitude and longitude (both degree).
*
* @param lat
* latitude
* @param lon
* longitude
*/
public Geopoint(final double lat, final double lon)
{
latitude = lat;
longitude = lon;
}
/**
* Creates new Geopoint with latitude and longitude parsed from string.
*
* @param text
* string to parse
* @throws Geopoint.ParseException
* if the string cannot be parsed
* @see GeopointParser#parse(String)
*/
public Geopoint(final String text) {
final Geopoint parsed = GeopointParser.parse(text);
this.latitude = parsed.latitude;
this.longitude = parsed.longitude;
}
/**
* Creates new Geopoint with latitude and longitude parsed from strings.
*
* @param latText
* latitude string to parse
* @param lonText
* longitude string to parse
* @throws Geopoint.ParseException
* if any argument string cannot be parsed
* @see GeopointParser#parse(String, String)
*/
public Geopoint(final String latText, final String lonText) {
this(GeopointParser.parseLatitude(latText), GeopointParser.parseLongitude(lonText));
}
/**
* Creates new Geopoint with given Location.
*
* @param loc
* the Location to clone
*/
public Geopoint(final Location loc) {
this(loc.getLatitude(), loc.getLongitude());
}
/**
* Create new Geopoint from Parcel.
*
* @param in
* a Parcel to read the saved data from
*/
public Geopoint(final Parcel in) {
latitude = in.readDouble();
longitude = in.readDouble();
}
/**
* Get latitude in degree.
*
* @return latitude
*/
public double getLatitude()
{
return latitude;
}
/**
* Get latitude in microdegree.
*
* @return latitude
*/
public int getLatitudeE6()
{
return (int) Math.round(latitude * 1E6);
}
/**
* Get longitude in degree.
*
* @return longitude
*/
public double getLongitude()
{
return longitude;
}
/**
* Get longitude in microdegree.
*
* @return longitude
*/
public int getLongitudeE6()
{
return (int) Math.round(longitude * 1E6);
}
/**
* Get distance and bearing from the current point to a target.
*
* @param target
* The target
* @return An array of floats: the distance in meters, then the bearing in degrees
*/
private float[] pathTo(final Geopoint target) {
float[] results = new float[2];
android.location.Location.distanceBetween(latitude, longitude, target.latitude, target.longitude, results);
return results;
}
/**
* Calculates distance to given Geopoint in km.
*
* @param gp
* target
* @return distance in km
* @throws GeopointException
* if there is an error in distance calculation
*/
public float distanceTo(final Geopoint gp)
{
return pathTo(gp)[0] / 1000;
}
/**
* Calculates bearing to given Geopoint in degree.
*
* @param gp
* target
* @return bearing in degree, in the [0,360[ range
*/
public float bearingTo(final Geopoint gp)
{
// Android library returns a bearing in the [-180;180] range
final float bearing = pathTo(gp)[1];
return bearing < 0 ? bearing + 360 : bearing;
}
/**
* Calculates geopoint from given bearing and distance.
*
* @param bearing
* bearing in degree
* @param distance
* distance in km
* @return the projected geopoint
*/
public Geopoint project(final double bearing, final double distance)
{
final double rlat1 = latitude * deg2rad;
final double rlon1 = longitude * deg2rad;
final double rbearing = bearing * deg2rad;
final double rdistance = distance / erad;
final double rlat = Math.asin(Math.sin(rlat1) * Math.cos(rdistance) + Math.cos(rlat1) * Math.sin(rdistance) * Math.cos(rbearing));
final double rlon = rlon1 + Math.atan2(Math.sin(rbearing) * Math.sin(rdistance) * Math.cos(rlat1), Math.cos(rdistance) - Math.sin(rlat1) * Math.sin(rlat));
return new Geopoint(rlat * rad2deg, rlon * rad2deg);
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null || !(obj instanceof Geopoint)) {
return false;
}
final Geopoint gp = (Geopoint) obj;
return getLatitudeE6() == gp.getLatitudeE6() && getLongitudeE6() == gp.getLongitudeE6();
}
@Override
public int hashCode() {
return getLatitudeE6() ^ getLongitudeE6();
}
/**
* Checks if given Geopoint is similar to this Geopoint with tolerance.
*
* @param gp
* Geopoint to check
* @param tolerance
* tolerance in km
* @return true if similar, false otherwise
*/
public boolean isEqualTo(Geopoint gp, double tolerance)
{
return null != gp && distanceTo(gp) <= tolerance;
}
/**
* Returns formatted coordinates.
*
* @param format
* the desired format
* @see GeopointFormatter
* @return formatted coordinates
*/
public String format(GeopointFormatter.Format format)
{
return GeopointFormatter.format(format, this);
}
/**
* Returns formatted coordinates with default format.
* Default format is decimalminutes, e.g. N 52° 36.123 E 010° 03.456
*
* @return formatted coordinates
*/
@Override
public String toString()
{
return format(GeopointFormatter.Format.LAT_LON_DECMINUTE);
}
/**
* Converts this geopoint to value type Direction.
*
* @return Direction
*/
public Direction asDirection() {
if (direction == null) { // because geopoint is immutable we can "cache" the result
direction = new Direction(latitude, longitude);
}
return direction;
}
/**
* Converts this geopoint to value type DDD.
*
* @return
*/
public DDD asDDD() {
if (ddd == null) {
ddd = new DDD(latitude, longitude);
}
return ddd;
}
/**
* Converts this geopoint to value type DMM.
*
* @return
*/
public DMM asDMM() {
if (dmm == null) {
dmm = new DMM(latitude, longitude);
}
return dmm;
}
/**
* Converts this geopoint to value type DMS.
*
* @return
*/
public DMS asDMS() {
if (dms == null) {
dms = new DMS(latitude, longitude);
}
return dms;
}
abstract public static class GeopointException
extends RuntimeException
{
private static final long serialVersionUID = 1L;
public GeopointException(String msg)
{
super(msg);
}
}
public static class ParseException
extends GeopointException
{
private static final long serialVersionUID = 1L;
public final int resource;
public ParseException(final String msg, final GeopointParser.LatLon faulty)
{
super(msg);
resource = faulty == GeopointParser.LatLon.LAT ? R.string.err_parse_lat : R.string.err_parse_lon;
}
}
public Double getElevation() {
try {
final String uri = "http://maps.googleapis.com/maps/api/elevation/json";
final Parameters params = new Parameters(
"sensor", "false",
"locations", format(Format.LAT_LON_DECDEGREE_COMMA));
final JSONObject response = Network.requestJSON(uri, params);
if (response == null) {
return null;
}
if (!StringUtils.equalsIgnoreCase(response.getString("status"), "OK")) {
return null;
}
if (response.has("results")) {
JSONArray results = response.getJSONArray("results");
JSONObject result = results.getJSONObject(0);
return result.getDouble("elevation");
}
} catch (Exception e) {
Log.w("cgBase.getElevation: " + e.toString());
}
return null;
}
//FIXME: this interface implementation is totally confusing as it returns the class itself.
// it can therefore be removed completely (and any invocation of it) without any disadvantages
@Override
public Geopoint getCoords() {
return this;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(final Parcel dest, final int flags) {
dest.writeDouble(latitude);
dest.writeDouble(longitude);
}
public static final Parcelable.Creator<Geopoint> CREATOR = new Parcelable.Creator<Geopoint>() {
public Geopoint createFromParcel(final Parcel in) {
return new Geopoint(in);
}
public Geopoint[] newArray(final int size) {
return new Geopoint[size];
}
};
}
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